我正在使用MVVM设计模式,并将ListView绑定到ViewModel中的ListCollectionView。我还有几个ComboBox用于过滤ListView。当用户从ComboBox中选择项目时,ListView会根据所选项目进行过滤。每当我想要在已经过滤的基础上进行过滤时,它会撤消我的先前过滤,就好像从未发生过一样。删除过滤器也是如此。删除一个ComboBox的过滤器会删除所有过滤器并显示原始列表。是否可能在同一个ListCollectionView上有多个独立的过滤器?
我是否做错了什么,还是这种情况根本不被支持?您可以在此处找到我应该完成的任务的屏幕截图。以下是我的筛选代码...
/// <summary>
/// Filter the list
/// </summary>
/// <param name="filter">Criteria and Item to filter the list</param>
[MediatorMessageSink("FilterList", ParameterType = typeof(FilterItem))]
public void FilterList(FilterItem filter)
{
// Make sure the list can be filtered...
if (Products.CanFilter)
{
// Now filter the list
Products.Filter = delegate(object obj)
{
Product product = obj as Product;
// Make sure there is an object
if (product != null)
{
bool isFiltered = false;
switch (filter.FilterItemName)
{
case "Category":
isFiltered = (product.Category.IndexOf(filter.Criteria, StringComparison.CurrentCultureIgnoreCase)) != -1 ? true : false;
break;
case "ClothingType":
isFiltered = (product.ClothingType.IndexOf(filter.Criteria, StringComparison.CurrentCultureIgnoreCase)) != -1 ? true : false;
break;
case "ProductName":
isFiltered = (product.ProductName.IndexOf(filter.Criteria, StringComparison.CurrentCultureIgnoreCase)) != -1 ? true : false;
break;
default:
break;
}
return isFiltered;
}
else
return false;
};
}
}